Enriched with vitamin D3, Zoo Med Repti Calcium provides pets with the essential nutrients they need to grow and thrive. This 3-ounce powder formula can be sprinkled over meals on a daily basis for easy consumption. This calcium supplement is a safe source of calcium carbonate. It is phosphorus-free and contains no harmful contaminants. The healthy dose of vitamin D3 enables reptiles to absorb enough calcium for proper bodily function.